Convert Opus to AAC Online Free
Convert your .opus files to .aac format. Free, fast, and processed entirely in your browser — your files never leave your device.
What is Opus?
Opus Interactive Audio Codec (.opus) — Opus is a modern, open-source audio codec designed for the internet. It excels at both voice and music, and is the standard codec for WebRTC, Discord, and WhatsApp calls.
What is AAC?
Advanced Audio Coding (.aac) — AAC is the successor to MP3, offering better sound quality at similar bitrates. It is the default audio format for Apple devices, YouTube, and many streaming services.
Opus vs AAC
| Feature | Opus | AAC |
|---|---|---|
| Full Name | Opus Interactive Audio Codec | Advanced Audio Coding |
| Compression | Lossy | Lossy |
| Typical Bitrate | 32-128 kbps | 128-256 kbps |
| Best For | Voice calls, VoIP, real-time audio, low-bandwidth streaming | Apple devices, streaming services, mobile audio |
| File Extension | .opus | .aac |
Frequently Asked Questions
Is converting Opus to AAC free?
Yes, completely free. The conversion runs entirely in your browser using WebAssembly — your files never leave your device and no sign-up is required.
Will I lose audio quality converting Opus to AAC?
Both Opus and AAC use lossy compression. There may be a slight quality loss from re-encoding. If possible, convert from the original lossless source.
What is the maximum file size?
You can convert audio files up to 100MB. Since the conversion happens in your browser, processing speed depends on your device's performance.
Is my audio file uploaded to a server?
No. All format conversion is processed locally in your browser using FFmpeg WebAssembly. Your files never leave your device, ensuring complete privacy.